Terminal Image Capture Adjusting Exposure for Motion
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Solution Overview
Problem
When capturing images with mobile terminals like smartphones and tablets, the images often become blurred due to the device's motion, as existing methods solely rely on ambient light parameters without considering the motion state, leading to suboptimal exposure settings.
Innovation Solution
A method that adjusts the exposure parameters based on both ambient light and motion parameters, specifically using shutter, aperture, and sensitivity values, by determining differences based on the motion range and applying adjustments such as shortening the exposure period and increasing sensitivity to ensure image quality during motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If exposure parameters are set based solely on ambient light parameters, then the exposure settings can be determined simply, but the captured images become blurred due to device motion
Solution Approach 1:
The patent changes the parameters used for exposure setting from only ambient light parameters to include both ambient light parameters and motion parameters. Specifically, it obtains motion parameters (such as shutter speed adjustments) based on detected device motion, and combines these with light parameters to determine final exposure parameters, thereby resolving the contradiction between simple settings and image clarity during motion
Solution Approach 2:
The patent implements a feedback mechanism by detecting device motion state and using this information to adjust exposure parameters. The system continuously monitors motion and adjusts the shutter speed and other exposure parameters accordingly, creating a closed-loop control that prevents image blur while maintaining adaptive exposure
2Manufacturing precision
If the shutter value is reduced to shorten exposure period during motion, then image blurriness is reduced, but light intake becomes insufficient
Solution Approach 1:
The patent adjusts multiple exposure parameters simultaneously rather than just the shutter value. When motion is detected, it modifies the shutter speed to reduce blur, but also adjusts aperture and sensitivity parameters to compensate for reduced light intake, maintaining a balance between image clarity and sufficient illumination
Solution Approach 2:
The patent applies different parameter adjustments based on the specific motion conditions and ambient light levels. Rather than using fixed adjustments, it dynamically determines the appropriate combination of shutter, aperture, and sensitivity modifications tailored to each shooting scenario, optimizing both clarity and light intake locally for each condition
3Use of energy by moving object
If the sensitivity is increased to compensate for reduced light intake, then light intake is sufficient, but image quality deteriorates due to noise
Solution Approach 1:
The patent employs a coordinated adjustment strategy where sensitivity is increased only when necessary and within controlled limits. It combines moderate sensitivity increases with aperture adjustments and optimized shutter speeds, avoiding excessive sensitivity boosting that would cause noise, thereby maintaining image quality while ensuring sufficient light intake
Solution Approach 2:
The patent applies partial action by making controlled, moderate adjustments to sensitivity rather than maximizing it. It uses just enough sensitivity increase to compensate for reduced light intake from faster shutter speeds, avoiding the excessive sensitivity that would introduce noise, thus achieving the right balance for maintaining image quality
Data Source
Figure 1~3A
Figure 3B~4
AI summary
The present disclosure relates to a method and a device for capturing an image and a computer readable storage medium. In the method, a current motion parameter of the terminal and a current ambient light parameter are acquired, a current exposure parameter of the terminal is set based on the current motion parameter of the terminal and the current ambient light parameter, and the image is captured based on the set current exposure parameter of the terminal. The exposure parameter includes a shutter value, an aperture value and a sensitivity.